|Title:||水稻粒重變異與產量及相關生理性狀間關係之研究||Other Titles:||RELATIONSHIP OF GRAIN WEIGHT VARIATION TO GRAIN YIELD AND THE RELATED PHYSIOLOGICAL CHARACTERISTICS IN RICE||Authors:||魏夢麗
M. L. Wei
Y. C. Kuo
D. J. Liu
|Keywords:||水稻;生理;性狀;產量;粒重||Issue Date:||Jun-1988||Publisher:||中華農學會||Journal Issue:||新142||Start page/Pages:||26-41||Source:||中華農學會報||Abstract:||
A medium-grain variety, Taiung 67, a large-grain variety, Pegonil, and their BC-4 and BC-5 offsprings were used in this experiment to study the relationship between grain weight and yield performance in rice. Results indicated that grain yield of large-grain variety was limited by total spikelet number per unit area of land. Dense planting could increase both panicle and grain numbers per unit area and hence grain yield. The effect was more significant in the first crop season. Thousand-grain-weight to the three BC-4 offsprings (28.5-32.2 g) was significantly higher whereas panicle number per hill and spikelet number per panicle were similar as compared to those of Tainung 67 variety. Production of total dry matter and grain was also comparable to those of Tainung 67 variety. Production of total dry matter and grain was also comparable between BC-4 populations and Tainung 67. Thousand-grain-weight of the eight BC-5 offsprings was between 25.3 and 34.7 g. Pronounced variation was also observed on other yield components. However, a number of the BC-5 populations possessed higher grain weight with total dry matter and grain yield comparable to those of Tainung 67, indicating significant improvement in yield potential as compared to the large-grain variety Pegonil. Leaf N concentration of Pegonil variety potential as compared to the large-grain variety Pegonil. Leaf N concentration of Pegonil variety was higher at heading but lower at maturity stage than Tainung 67. Grain N concentration was also markedly higher for Pegonil. Those facts suggested significant redistribution of N during the grain-filling period. Leaf N concentration was similar between Pegonil and BC-4 and between Tainung 67 and BC-5 populations which indicated possible variations in N metabolism and utilization efficiency between plants of different grain weight. No difference in culm TNC concentration at heading stage existed between virilities and backcross offsprings in the first crop season. Culm TNC at maturity was higher for backcross plants than for Pegonil plants, presumably the result of higher photosynthetic capability and more balanced carbon budget for the former. Backcross populations used in this experiment was not isogenic in terms of their genetic homogeneity. However, their agronomic, physiological and yield characteritics had been improved significantly compared to the large-grain Pegonil. It was therefore concluded that physiologically, it should be possible to enhance grain yield of rice through increasing grain weight.
|Appears in Collections:||(1)作物組|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.